Sol-gel synthesis of amphiphilic
silsesquioxane capable of forming reverse
micelle
著者
NAGATOMO Akito, KANEKO Yoshiro
journal or
publication title
The Research Reports of the Faculty of
Engineering, Kagoshima University
volume
58
page range
68-68
year
2017-03
2015 International Chemical Congress of Pacific Basin Societies December 15-20, 2015, HONOLULU, HAWAII
Sol-gel synthesis of amphiphilic silsesquioxanecapable of forming reverse micelle
Akito Nagatomo and Yoshiro Kaneko*
Graduate School of Science and Engineering, Kagoshima University, Japan
Abstract
Amphiphilic molecules can form reverse micelles in non-polar organic solvents. Most of these molecules are organic compounds. On the other hand, the amphiphilic molecules containing inorganic components may become the materials capable of forming reverse micelles with exotic functions.
So far, we have reported the preparation of water-soluble ammonium group-containing ladder-like polysilsesquioxanes (PSQs), as soluble inorganic materials, by the sol-gel reaction of 3-aminopropyltrimethoxysilane (APTMS) in aqueous hydrochloric acid.1
In this study, we prepared an amphiphilic silsesquioxane (Am-SQ) capable of forming a reverse micelle by the sol-gel reaction of a mixture of APTMS and triethoxysilane containing ether-chain (TES-EC) in aqueous hydrochloric acid.2
First, TES-EC was prepared by the reaction of 3-(triethoxysilyl)propyl isocyanate with triethyleneglycol monomethylether. Then, the sol-gel reaction of a mixture of TES-EC and APTMS was performed by stirring in aqueous hydrochloric acid at room temperature, followed by heating in an open system until the solvent was completely evaporated. After the resulting solid product was washed with acetone, chloroform was added into the product. The soluble-part was isolated by filtration and the solvent was removed. The resulting product was dried under reduced pressure to obtain Am-SQ.
In the DLS and GPC measurements of Am-SQ in chloroform, there was a correlation
between the particle sizes or excluded volumes (molecular weights) and the concentrations, i.e. larger particle sizes or higher molecular weights for higher concentrations. These results indicate that Am-SQ can form reverse micelle at relatively higher concentration in chloroform. The reverse micelle of Am-SQ can incorporate hydrophilic dye compounds.
References
1. Y. Kaneko et al., Chem. Mater., 16, 3417 (2004).; Polymer, 46, 1828 (2005).; Z.
Kristallogr., 222, 656 (2007).; Int. J. Polym. Sci., 684278 (2012).
2. A. Nagatomo and Y. Kaneko, J. Nanosci. Nanotechnol., 2016, in press.
